Desktop Computer Repair Dundee

You’re in a rush to finish a project for work, and with no warning your screen goes black. Or you push the power button and nothing happens. No sound of fans starting up, just silence where there should be the familiar hum of your computer coming to life.

Desktop problems never happen when it’s convenient. Blue screens in the middle of something important. Random shutdowns when you’re halfway through saving a file. A machine that used to fly now taking three minutes to open a spreadsheet.

We’ve been fixing desktops, towers, all-in-ones, and custom-built PCs at our Perth Road workshop for over twenty years. We’ll diagnose the fault, explain what’s wrong in plain English, and give you an honest quote before touching anything. If it’s not worth fixing, we’ll say so. Computer hardware repair, laptop repair, data recovery when things go properly sideways. If it sits on a desk, we can fix it.

What to Do When Your Desktop Won’t Start

Complete silence when you press the power button is the most common desktop fault we see. Before you bring it in, there are a few things worth checking:

• Check power connections. Make sure the cable is firmly plugged into both the computer and the wall. They work loose over time, especially if the PC gets moved.
• Test the power outlet. Plug something else into the same socket to confirm it’s working. You’d be surprised how often it’s a tripped fuse.
• Listen when you press the button. Any beeping, clicking, or brief fan spin tells us something useful about what’s failed.
• Check for lights. Even a small LED on the case or power button gives us a clue.
• Remove external devices. Disconnect USB drives, printers, and peripherals, then try again. External devices can sometimes cause startup conflicts.

If none of that works, the issue needs hands-on diagnosis. It’s usually the power supply, sometimes the motherboard, occasionally the power button itself. We’ll test each possibility and tell you exactly what’s failed before quoting.

Common Desktop Hardware Faults

Hardware issues account for about 60% of the desktop repairs that come through the workshop. Here’s what we see most often from folk across Dundee, Broughty Ferry, and the surrounding area.

Hard drive and SSD failure. Your hard drive stores everything, so when it starts failing, you might hear clicking sounds or get error messages about missing files. SSDs fail differently, often going from working perfectly to completely dead without warning. Either way, we can usually recover your data even from drives that seem completely gone. The sooner you bring it in, the better the chances.

Power supply failure. If your desktop won’t turn on at all, or randomly shuts down mid-use, the PSU is the first suspect. Power supplies work hard every day, and cheaper no-name units are especially prone to failure. A dead PSU is a straightforward swap. Occasionally a failing PSU damages the motherboard on its way out, which is why we always test both. See our power supply repair page for more detail.

RAM failure. Random crashes, blue screens, or programs that close without warning. Your computer’s memory can develop faults that only show up intermittently, which makes them tricky to catch with a quick test. We run extended diagnostics overnight to identify faulty sticks reliably.

Motherboard issues. Blown capacitors, failed voltage regulators, or damage from a PSU that went bad. Desktop motherboards are standardised, so replacements are usually available and practical to fit. We’ll diagnose exactly which component has failed before recommending a board swap. More detail on our motherboard repair page.

Software Problems

Virus and malware infections. Despite what some folk think, desktop computers absolutely still get viruses. They slow everything down, steal your information, or lock you out of your own machine entirely. We remove the infection and clean up whatever damage it’s caused. See our virus removal page.

Operating system corruption. Windows can get corrupted after failed updates or sudden power cuts. Your computer might not start properly, crash repeatedly, or get stuck in a restart loop. A clean Windows installation with your data preserved is usually the fix.

Driver conflicts. When different pieces of hardware or software don’t work together properly, you get crashes, freezing, or devices that just stop responding. This is especially common after Windows updates change driver versions without asking.

Slow Performance and Freezing

If your desktop takes ages to boot up, it’s usually because too many programs are trying to start at once, or your hard drive is getting full and fragmented. Random freezing can be caused by overheating, failing hardware, or software conflicts.

Overheating is a bigger problem in desktops than most folk realise. Dust accumulation is responsible for roughly 70% of overheating cases. It coats the fans and heatsinks over months and years. The processor runs hotter, the fans spin louder, and eventually the machine throttles itself or shuts down to prevent damage. A proper internal clean with fresh thermal paste sorts this out. We recommend it every three to four years for desktops, sooner if the machine lives on or near the floor where it pulls in more dust.

If the machine was slow before it developed a specific fault, fixing that fault won’t magically make it fast. That’s when an SSD or RAM upgrade makes the real difference.

Gaming and High-Performance Desktops

Gaming rigs and high-performance workstations have their own set of problems. They generate more heat, push components harder, and when something goes wrong, the symptoms can be harder to pin down.

Graphics card problems. Visual glitches, crashes during games, or the monitor showing nothing at all. If you work with video editing, 3D rendering, or CAD, a failing GPU brings everything to a stop. We diagnose whether it’s the card, the drivers, or a power delivery issue.

Power delivery issues. Modern graphics cards draw significantly more power than older models. If your PSU isn’t rated high enough for your current GPU, you’ll get crashes under load, black screens during games, or the whole system shutting down. We test power delivery as part of any gaming PC diagnosis.

Cooling failures. Custom loops spring leaks. AIO coolers lose pump pressure. Air coolers clog with dust. When the cooling can’t keep up, the processor and GPU throttle themselves and your frame rates tank. We service both air and liquid cooling setups.

Graphics card upgrades. If your GPU can’t keep up with newer games or creative applications, we can advise on compatible replacement cards. Desktop GPUs are standardised (PCIe), but you need to match the card to your power supply wattage, your case size, and your monitor connections. We check all of these before recommending a card so you don’t end up with something that doesn’t fit or doesn’t have enough power behind it.

Performance tuning. Sometimes a gaming PC just isn’t running as well as it should. Thermal throttling, background processes hogging resources, BIOS settings that aren’t optimised. We can diagnose what’s holding it back and get those frame rates back where they should be.

All-in-One Computers

All-in-one desktops (iMacs, Dell Inspiron AIOs, HP All-in-Ones, Lenovo IdeaCentres) look like monitors but have the entire computer built into the screen housing. They’re tidier than a tower and monitor setup, but they’re harder to repair and upgrade because everything is packed into a tight space with limited airflow.

The most common AIO problems we see are overheating (less room for fans), hard drive failure (made worse by the heat), and screen issues (which are more complex to fix than a standalone monitor because the display is integrated with the computer). We work on all major AIO brands. For iMac-specific repairs, the screen is bonded with adhesive and requires careful disassembly.

Upgrades are more limited on all-in-ones than towers. RAM and storage (SSD) are usually upgradeable, but the processor and graphics are typically soldered to the board. We’ll tell you what’s possible for your specific model.

SSD and RAM Upgrades

One of the big advantages desktops have over laptops is how easy they are to upgrade. The components are standardised, there’s room to work inside the case, and you can swap individual parts without replacing the whole machine. That means two relatively cheap upgrades can make a desktop that’s technically working but painfully slow feel like new again.

SSD upgrade. If your desktop still has a mechanical hard drive, replacing it with an SSD is the single most noticeable improvement you can make. Boot times drop from minutes to seconds. Programs open instantly. We clone your existing drive so nothing changes except the speed. For more on this, see our hard drive repair page.

RAM upgrade. If your desktop slows down the more you do (lots of browser tabs, multiple programs running), you’re running out of working memory. Four gigabytes isn’t enough for Windows 11. Eight is the minimum. Sixteen is where things get comfortable. We check compatibility, fit the right spec, and test for stability. More detail on our memory upgrade page.

Both upgrades together cost a fraction of a new machine and the performance difference is dramatic. It’s what we recommend for any desktop over three years old that’s otherwise healthy.

Desktop Maintenance

Desktops benefit from regular maintenance more than most folk realise. An annual internal clean (compressed air, fan check, thermal paste on machines over three years old) prevents the gradual buildup of dust that causes overheating and component failure. For businesses running desktops daily, we can set up a maintenance schedule. Preventative servicing is cheaper than emergency repairs and keeps machines running reliably for longer. For home users, bringing your desktop in every couple of years for a clean and health check is worth doing, especially if it lives on or near the floor.

Repair or Replace: How to Decide

The question we get asked more than any other. With new desktop prices still elevated in 2026, the economics of repair have rarely been more favourable. Here’s how to think about it.

Repair makes sense when:

• Your desktop is less than five years old and was decent quality when new
• The problem is isolated to one component (hard drive, PSU, RAM, GPU)
• You’re running specialised software that would need repurchasing on a new machine
• Your data setup and programs are exactly how you want them
• The repair costs less than half what a comparable replacement would cost

Replacement makes more sense when:

• The machine is over seven years old (other components are likely to start failing soon)
• Multiple major components have failed at once
• Performance wasn’t meeting your needs even before the current problem
• The repair cost approaches what a decent new machine would cost

We’ll always give you an honest assessment. If we think replacement is the better call, we’ll say so, even though it means less business for us. We also help with data transfer from old machine to new if you go that route.

What to Expect When You Bring It In

Step one: bring in the tower. Walk into 153 Perth Road during opening hours. No appointment needed. Just the tower or main unit is fine. We have all the monitors, keyboards, and cables we need for testing. Saves you lugging the whole setup.

Step two: we diagnose and call you. We run a full diagnostic. Hardware, software, the lot. None of it’s a quick glance. Once we know what’s wrong, we explain it in plain English and give you a clear quote. No hidden costs.

Step three: your call. If you give us the go-ahead, we fix it with quality parts and test everything thoroughly before you collect. Stress-test the hardware, check your programs are running, verify your data is intact. If we’ve cleaned out a virus, we make sure the system is properly protected before it leaves.

Turnaround: simple software fixes are often done same day. Hardware repairs typically take one to five working days depending on parts availability. We know where to source hard-to-find components, especially for older machines. We’ll give you a realistic timeframe when we diagnose the problem.

Warranty: every repair comes with a 90-day warranty. If something’s not right, bring it back. Nae arguments, nae excuses.

Brands We Fix

Manufacturers: Dell, HP, Lenovo, ASUS, Acer, custom-built PCs, gaming rigs, Apple Mac desktops (iMac, Mac Mini, Mac Pro), and all-in-one computers. If it’s a desktop, we can work on it.

Systems: Windows 10, Windows 11, macOS, Linux. We stock common parts for popular models and source specific components within one to two working days for anything unusual.

For laptop-specific repairs, see our laptop repair page. For MacBook-specific work, we have dedicated pages for screen replacement, keyboard replacement, and battery replacement.